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A mother naturally feels protective towards her children.
做母亲的天生要保护自己的孩子。
2.ensure vt.确保, 担保
例句：I will ensure that the car arrives by six o'clock.
我保证汽车六点钟以前到。
We ensured it to be pure.
我们担保它是纯的。
3.tip n.顶,尖端,梢,末端,倾斜,垃圾场,小费,轻击,告诫,秘密消息
4.mention vt.提到, 说起
例句：He mentioned them by name.
他举出了他们的名字。
Before closing I want to mention all those who contributed so generously.
在我结束讲话的时候, 我想提一下所有慷慨捐赠的人。
